1212733621 has 8 divisors (see below), whose sum is σ = 1351131264. Its totient is φ = 1079027520.

The previous prime is 1212733591. The next prime is 1212733649. The reversal of 1212733621 is 1263372121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212733621 - 2²⁹ = 675862709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212733621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212733421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1172340 + ... + 1173373.

It is an arithmetic number, because the mean of its divisors is an integer number (168891408).

Almost surely, 2^1212733621 is an apocalyptic number.

1212733621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212733621 is a deficient number, since it is larger than the sum of its proper divisors (138397643).

1212733621 is a wasteful number, since it uses less digits than its factorization.

1212733621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345771.

The product of its digits is 3024, while the sum is 28.

The square root of 1212733621 is about 34824.3251334466. The cubic root of 1212733621 is about 1066.4040995111.

The spelling of 1212733621 in words is "one billion, two hundred twelve million, seven hundred thirty-three thousand, six hundred twenty-one".